1 5/8" Cat4ward HeadersI had originaly ordered headman headers for my car and when they showed up i was highly disapointed the paint was flaking off them and they had weld gobs on the seams so i sent them back and orderd the JBA headers the differance was night and day The nickle plating looks awsome, the mountiing hardware and gaskets were all included.
the HP differance was very noticiable..
i would highly recommend JBA headers to anyone